Latest ROS2 versions, require mesh file paths to start with
file://, instead of
package://, which no longer works (see Gazebo does not spawn mesh - ROS Answers: Open Source Q&A Forum).
The urdf importer imports the filename with the
file:// prefix, which is unsupported in Isaac sim.
Output from terminal:
Failed to resolve mesh 'file:///home/amram/development/nakai/packages/nakai-onboard/install/nakai_robot/share/nakai_robot/meshes/nakai_rear.dae'
Urdf importer should trim this prefix.